This paper presents the development of a new methodology for the simulation of power line communication (PLC) within the popular electromagnetic transients programme-alternative transients programme (EMTP-ATP). As a first application, the comparative performance of the emerging orthogonal frequency division multiplexing (OFDM) based Prime and G3-PLC narrowband standards is investigated. Models of both standards have been created within the EMTP-ATP and simulations performed using frequency-dependent line models and realistic transformer models as terminations. It is observed that both standards are severely affected by the highly frequency selective nature of the Medium Voltage (MV) power line channel and a more considered choice of OFDM parameters may be necessary for optimal performance on MV networks.

This paper proposes the use of a LoRa like chirp spread spectrum physical layer as the basis for a new Power Line Communication modulation scheme suited for low-bandwidth communication. It is shown that robust communication can be established even in channels exhibiting extreme multipath interference, impulsive noise and low SNR (−40 dB), with synchronisation requirements relaxed compared to conventional LoRa. ATP-EMTP simulations using frequency dependent line and transformer models, and simulations using artificial Rayleigh channels demonstrate the effectiveness of the new scheme in providing load data from LV feeders back to the MV primary substation. Our results demonstrate error-free communication at SNRs of −40 dB, and can be further improved by trading-off data rate. We further present experimental results based on a Field Programmable Gate Array hardware implementation which match the simulated performance.

This article addresses the critical need to reduce grounding impedance for the protection of both individuals and electrical equipment under normal and faulty conditions. While numerous techniques exist for low-frequency applications, challenges arise at higher frequencies due to the inductive behavior inherent in grounding systems. The efficacy of low resistivity material as a solution to decrease grounding impedance at high frequencies is investigated. Through experimental studies using vertical ground electrodes with varied lengths and some backfilled with a commercial conductive aggregate compound, grounding impedance is analyzed across the frequency range between 10 Hz and 10 MHz. A considerable reduction in grounding impedance is achieved. Based on these findings and other published results, practical insights for designing effective grounding systems are derived, where alternative arrangements are proposed, exhibiting promising results for further enhancing high-frequency performance.

Many fault-location algorithms rely on a simulation model incorporating network parameters which closely represent the real network. Estimations of the line parameters are usually based on limited geometrical information which do not reflect the complexity of a real network. In practice, obtaining an accurate model of the network is difficult without comprehensive field measurements of each constituent part of the network in question. Layer-peeling algorithms offer a solution to this problem by providing a fast “mapping” of the network based only on the response of a probing impulse. Starting with the classical “Schur” layer-peeling algorithm, this paper develops a new approach to map the reflection coefficients of an electrical network, then use this information post-fault to determine accurately and robustly the location of either permanent or incipient faults on overhead networks. The robustness of the method is derived from the similarity between the post-fault energy reaching the observation point and the predicted energy, which is based on real network observations rather than a simulation model. The method is shown to perform well for different noise levels and fault inception angles on the IEEE 13-bus network, indicating that the method is well suited to radial distribution networks.

A new, low-cost method of simultaneously measuring and communicating voltage and current on distribution networks is presented. Based on Frequency Modulation (FM) of the measured fundamental frequency (and harmonics), followed by immediate re-injection of the modulated waveform back into the network, the proposed method can be implemented using inexpensive and readily available electronics. Furthermore, the method does not require a separate communication media, but instead uses the power line itself to propagate the FM signals back to a central point. EMTP-ATP simulations on a mixed LV/MV network are performed and experimental analysis demonstrates the practicality and robustness of the new method. The low-cost of the method would suit deployment on parts of the network which are otherwise overlooked for monitoring.

Grounding systems such as vertical and horizontal electrodes, and grids are installed in the soil to mitigate against the effects of system faults and lightning surges. Their main function is to dissipate lightning and fault currents into the earth without generating any hazardous potential differences between different contacts points of grounded structures and the earth that may be bridged by people or sensitive electrical equipment. In this investigation, field tests applying both low voltage impulse and variable frequency energisations to a horizontal earth electrode installed in a low resistivity soil medium have been carried out. The frequency response is determined from the AC variable frequency test over frequency (50Hz up to 1MHz). Numerical models of the tested electrodes were simulated considering the effect of soil parameters and the results were compared with field tests measurements.